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LTC4100

更新时间： 2024-09-30 04:00:35
品牌 Logo 应用领域
凌特 - Linear 电池控制器
页数 文件大小 规格书
24页 252K
描述
Smart Battery Charger Controller

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LTC4100 数据手册

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LTC4100  
Smart Battery  
Charger Controller  
U
July 2003  
DESCRIPTIO  
FEATURES  
The LTC®4100 Smart Battery Charger is a single chip  
charging solution that dramatically simplifies construc-  
tion of an SBS compliant system. The LTC4100 imple-  
ments a Level 2 charger function whereby the charger can  
beprogrammedbythebatteryorbythehost.ASafetySignal  
on the battery being charged is monitored for tempera-  
ture,connectivityandbatterytypeinformation.TheSMBus  
interface remains alive when the AC power adapter is  
removed and responds to all SMBus activity directed to  
it, including SafetySignal status (via the ChargerStatus  
command). The charger also provides an interrupt to the  
host whenever a status change is detected (e.g., battery  
removal, AC adapter connection).  
■
Single Chip Smart Battery Charger Controller  
■
100% Compliant (Rev. 1.1) SMBus Support allows  
for Operation with or without Host  
■
SMBus Accelerator Improves SMBus Timing*  
■
Wide Output Voltage Range: 6.4V to 26V  
■
Hardware Interrupt and SMBAlert Response  
Eliminate Interrupt Polling  
■
High Efficiency Synchronous Buck Charger  
■
0.5V Dropout Voltage; Maximum Duty Cycle > 98%  
■
AC Adapter Current Limit Maximizes Charge Rate  
■
±0.8% Voltage Accuracy; ±5% Current Accuracy  
■
Up to 4A Charging Current Capability  
■
10-Bit DAC for Charge Current Programming  
■
11-Bit DAC for Charger Voltage Programming  
Charging current and voltage are restricted to chemistry  
specific limits for improved system safety and reliability.  
Limits are programmable by two external resistors. Addi-  
tionally,themaximumaveragecurrentfromtheACadapter  
is programmable to avoid overloading the adapter when  
simultaneously supplying load current and charging  
current. When supplying system load current, charging  
current is automatically reduced to prevent adapter over-  
load.**  
■
User-Selectable Overvoltage and Overcurrent Limits  
■
High Noise Immunity SafetySignal Sensor  
■
Small 24-Pin Narrow (0.209") SSOP Package  
U
APPLICATIO S  
■
Portable Instruments and Computers  
■
Data Storage Systems and Battery Backup Servers  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
*U.S. Patent No. 6,650,174 **U.S. Patent No. 5,723,970  
U
TYPICAL APPLICATIO  
DCIN  
0.1µF  
13.7k  
1.21k  
3V  
TO 5.5V  
0.1µF  
0.033Ω  
LTC4100  
17  
V
5
DCIN  
INFET  
CLP  
DD  
11  
4
5k  
DCDIV  
CHGEN  
ACP  
6
10  
7
24  
23  
1
CHGEN  
ACP  
20µF  
10µH  
SMART BATTERY  
CLN  
0.025Ω  
SMBALERT TGATE  
9
3
SCL  
SDA  
THB  
THA  
BGATE  
PGND  
CSP  
8
2
20µF  
15  
16  
13  
14  
20  
21  
22  
18  
19  
12  
BAT  
I
V
SET  
LIM  
1.13k  
100Ω  
V
LIM  
I
0.01µF  
0.1µF  
TH  
I
GND  
6.04k  
0.12µF  
10k  
DC  
0.0015µF  
54.9k  
0.082µF  
SafetySignal  
SMBALERT#  
SMBCLK  
SMBCLK  
SMBDAT  
SMBDAT  
4100 TA01  
Figure 1. 4A Smart Battery Charger  
sn4100 4100is  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
1
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